I went online and purchased a 10 gallon water cooler from Lowe's to store my fresh water for top offs. Since I don't have the room for a ATO system (space is limited) and I don't have an RO/DI system I use the API Tap Filter which has been great for me. Once I do this, I still add some Prime to make sure. Since I have done this, I have noticed a huge difference compared to me using tap water with Prime in the tank.

I have a FOWLR 36 gallon tank and usually have to add about 1 gallon every 3-4 days for top offs. So since I have to pull out and hook up the API Tap Filter each time, I usually would store them in six 1 gallon jugs but with this cooler I have 10 gallons and that should last me an entire month of top off.

The best thing is the regular price for the cooler is over $49 but if you buy it online now you can get it for under $13:

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Reef aquariums made easy with 3reef aquarium forums - one of the oldest and friendliest aquarium forums online. 3reef came online in 1996 as 'Three Steps To A Reef Aquarium.' This title was created as an attempt to overcome the common fears associated with keeping a reef aquarium, especially at that time. 3reef still retains its roots and remains a friendly forum for new people interested in aquariums and veteran hobbyist alike.